Wandering Merchant

At the beginning of your end step, the player
to your left gains control of travelling merchant.
{w}: You gain 4 life.
{u}: Investigate.
{b}: Create a 0/1 black thrull creature token.
{r}: Discard a card then draw a card.
{g}: Search your library for a basic land card and put
it into your hand then shuffle.

He never managed to put down roots.